| Perry Hall to Oskaloosa (Iowa) | 859.68 mi (1,383.51 km) |
| Perry Hall to Oswego (Illinois) | 641.63 mi (1,032.60 km) |
| Perry Hall to Oswego (New York) | 279.47 mi (449.77 km) |
| Perry Hall to Otsego (Minnesota) | 962.02 mi (1,548.22 km) |
| Perry Hall to Ottawa (Illinois) | 663.09 mi (1,067.14 km) |
| Perry Hall to Ottawa (Kansas) | 1,008.38 mi (1,622.83 km) |
| Perry Hall to Ottumwa (Iowa) | 847.21 mi (1,363.45 km) |
| Perry Hall to Overland (Missouri) | 746.21 mi (1,200.91 km) |
| Perry Hall to Overland Park (Kansas) | 974.72 mi (1,568.65 km) |
| Perry Hall to Overlea (Maryland) | 3.62 mi (5.83 km) |
| Perry Hall to Oviedo (Florida) | 789.78 mi (1,271.02 km) |
| Perry Hall to Owasso (Oklahoma) | 1,075.44 mi (1,730.75 km) |
| Perry Hall to Owatonna (Minnesota) | 920.21 mi (1,480.94 km) |
| Perry Hall to Owensboro (Kentucky) | 585.45 mi (942.20 km) |
| Perry Hall to Owings Mills (Maryland) | 16.73 mi (26.92 km) |
